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sgml: add sgmlerr

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Signed-off-by: Simon Rozman <simon@rozman.si>
This commit is contained in:
Simon Rozman 2023-12-23 08:19:43 +01:00
parent fdf16a65b6
commit d981225ba8
1 changed files with 73 additions and 0 deletions
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73
include/stdex/sgml.hpp
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@ -78,6 +78,79 @@ namespace stdex
constexpr int sgml_c = sgml_amp | sgml_bsol | sgml_quot_apos;
// constexpr int sgml_kolos = sgml_amp | sgml_quot | sgml_dollar | sgml_percnt | sgml_lt_gt | sgml_bsol/* | sgml_commat | sgml_num*/ | sgml_lpar_rpar | sgml_lcub_rcub | sgml_lsqb_rsqb;
///
/// Checks SGML string for error
///
/// \param[in] src SGML string
/// \param[in] count_src SGML string character count limit
/// \param[in] what Bitwise flag of stdex::sgml_* constants that force extra checks. Currently, only stdex::sgml_full is used, which enforces 7-bit/ASCII checking.
///
/// \return Index of error; or stdex::npos if no error detected.
///
template <class T_from>
size_t sgmlerr(
_In_reads_or_z_opt_(count_src) const T_from* src, _In_ size_t count_src,
_In_ int what = 0)
{
_Assume_(src || !count_src);
const bool
do_ascii = (what & sgml_full) == 0;
for (size_t i = 0; i < count_src && src[i];) {
if (src[i] == '&') {
auto end = sgmlend(src + i + 1, count_src - i - 1);
if (end) {
const wchar_t* entity_w;
wchar_t chr[3];
size_t n = end - src - i - 1;
if (n >= 2 && src[i + 1] == '#') {
uint32_t unicode;
if (src[i + 2] == 'x' || src[i + 2] == 'X')
unicode = strtou32(src + i + 3, n - 2, nullptr, 16);
else
unicode = strtou32(src + i + 2, n - 1, nullptr, 10);
#ifdef _WIN32
if (unicode < 0x10000) {
chr[0] = (wchar_t)unicode;
chr[1] = 0;
}
else {
ucs4_to_surrogate_pair(chr, unicode);
chr[2] = 0;
}
#else
chr[0] = (wchar_t)unicode;
chr[1] = 0;
#endif
entity_w = chr;
}
else
entity_w = sgml2uni(src + i + 1, n);
if (entity_w) {
i = end - src + 1;
continue;
}
// Unknown entity.
return i;
}
// Unterminated entity.
return i;
}
if (do_ascii && !is7bit(src[i])) {
// Non-ASCII character
return i;
}
i++;
}
return npos;
}
///
/// Convert SGML string to Unicode (UTF-16 on Windows) and append to string
///